Ô nhiễm phóng xạ. Ô nhiễm tiếng ồn, bao gồm tiếng ồn do xe cộ, máy bay, tiếng ồn công nghiệp. Ô nhiễm sóng, do các loại sóng như sóng điện thoại, truyền hình. tồn tại với mật độ lớn. | ACETONE Synonyms 2-propanone dimethyl ketone Formula CH3COCH3 MW CAS 67-64-1 used as a common solvent in many organic syntheses and in paint and varnish removers colorless liquid characteristic odor sweetish taste boils at C vapor pressure 180 torr at 20 C freezes at -94 C density g ML at 20 C readily mixes with water and organic solvent highly flammable. ANALYSIS OF AQUEOUS SAMPLES Aqueous samples purged by an inert gas analyte trapped on a sorbent trap transferred onto a GC column by heating the trap and backflushing with helium determined by GC MS. Purging efficiency of acetone is poor because of its high solubility in water. The purging vessel should be heated. The characteristic masses for GC MS identification 43 and 58. GC column Carbowax 20M Carbopack or a fused silica capillary column such as DB-5 SPB-5 or equivalent. Alternatively an aliquot of aqueous sample dứectly injected onto an appropriate GC column for FID determination. The detection range on the FID by dứect injection without sample concentration is several order higher than the purge and trap method when purging vessel heated . Trace acetone in water may be determined by a fast HPLC method Takami et al. 1985 aqueous sample passed through a cartridge packed with a moderately sulfonated cation-exchange resin charged with 2 4-dinitrophenylhydrazine DNPH DNPH derivative eluted with acetonitrile and analyzed by HPLC with a 3-mm ODS column. Precision and accuracy data for all the three above methods not available. 1997 by CRC Press LLC ACETONE Synonyms 2-propanone dimethyl ketone Formula CH3COCH3 MW CAS 67-64-1 used as a common solvent in many organic syntheses and in paint and varnish removers colorless liquid characteristic odor sweetish taste boils at C vapor pressure 180 torr at 20 C freezes at -94 C density g ML at 20 C readily mixes with water and organic solvent highly flammable. ANALYSIS OF AQUEOUS SAMPLES Aqueous samples purged by an inert gas analyte .
